Martin Audio W8L Longbow Application Manual

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User manual (22 pages)

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Page 2 Century Point, Halifax Road, Cressex Business Park, High Wycombe, Buckinghamshire. UK. The information presented in this document is, to the best of our knowledge, correct. Martin Audio Limited will not, however, be held responsible for the consequences of any errors or omissions.
Page 3 Wavefront W8L Series Line Arrays 5.1 Introduction Martin Audio W8L Series line arrays are next generation line array systems which combine innovative loudspeaker design techniques with line array technology to produce a family of very powerful line arrays with extended frequency response, smooth coverage and maximum dynamic impact.
Page 4 WLX. W8L Longbow, W8LC and W8LM systems combine patentable driver loading techniq ues - researched and proven by Martin Audio over many years - with no- compromise vertically-coupled waveguides and true constant directivity horns to achieve a level of efficiency and coverage consistency not usually found in this popular format.
Page 5 Flying professional loudspeaker systems is not a job for amateurs! See the appropriate Flying System User Manual for further details. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 6 HF: 109dB Passive 99dB LF rising to 105dB HF Max SPL (spl calc 1m) Bi-amplified LF+MF: 136dB cont., 129dB cont., 125dB cont., 142dB peak. 135dB peak. 131 dB peak. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 7 (W) 39.4 (W) 24.4 inches (H) 19.3 (H) 14.5 (H) 9.5 (*incl wheelboard) (D)29.7/33.7* (D) 21.7/26.9* (D) 15.75 Weight (incl. steel hardware) 120Kg 58Kg (1 28lbs) 24Kg (53lbs) (264lbs) All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 8 W8L Longbow & W8LS outline dimensions (W8LS shown) All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 12 Horizontal polar responses (Vertical response are 7.5deg line functions for W8L, W8LC & W8LM and 20deg line function for W8LD, W8LCD & W8LMD) For further W8LD details, go to www.martin-audio.com All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 13 For further W8LCD details, go to www.martin-audio.com All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 14 For further W8LMD details, go to www.martin-audio.com All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 15 * = speed of sound (m/s).Varies with temp. Arcsin = "the angle whose sin is…" Nd = the total height of the column in meters All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 16 Three tightly arrayed low curvature horns at 8kHz Closely spaced elements will sum more coherently. As the number of coherent elements is increased forward projection strengthens and the side lobes decrease. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 18 In practice, of course, line array characteristics are more complex. The contribution of individual elements will depend on their amplitude, relative phase and directivity – especially when the array is curved to cover a practical audience shape. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 19 ViewPoint simply advises on the appropriate array geometry and controller presets for a given 2-D room geometry. DISPLAY™ operates may be used in 2-D or 3-D and predicts polar responses, coverage levels and frequency responses. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 20 Irregular coverage from a J-shaped Array (including down-fills) – DISPLAY™ simulation All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 21 It is possible to create a remarkably flat level response with distance using the appropriate combination of progressive curvature, le vel control and equalisation. 14xW8LM+2xW8LMD set for almost flat level response – DISPLAY™ simulation All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 22 (a falling response with frequency by up to 0.8dB per octave). For more information on band-zoning, see the information on System control or the relevant Longbow, W8LC W8LM quick start section. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 23 The following curves show the spectral balance of 4 and 12 W8L cabinets vs distance taking air absorption into account for about 40% relative humidity. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 24 The chart is based on applications experience and line array physics as it is currently understood. Note: The cabinet quantities refer to low curvature arrays or the low curvature (upper) sections of progressively curved arrays. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 25 The following ViewPoint examples indicate the quantity of cabinets that can be regarded as contributing to the system’s mid and high frequency far- field characteristic. 12xW8L or Longbow (at 1°) per side festival system in side wings for 100m throw All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 26 16xW8L or Longbow per side arena system Upper 12 cabinets at 1 & 2° for 100m throw Array detail for above All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 27 (splayed at 0°) Max dB spl Max dB spl Max dB spl cont. cont. cont. Effective source spl (referred to 1m) - at 0° splay - vs model & quantity All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 28 100% R.H. 0.7dB 0.6dB 1.4dB 1.2dB 2.8dB 2.3dB 128m 16dB 5.6dB 4.6dB 256m 32dB 16dB 11dB 9.2dB Excess air attenuation vs distance at 6KHz (20°C at sea level) All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 29: Table Of Contents
Array fixing 5.5.8 Designing a flown array 5.5.9 Stacked systems 5.5.10 Venue name 5.5.11 Editing ViewPoint designs 5.5.12 Frequently asked question 5.5.13 Using ViewPoint for systems with subwoofers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 31: Installing Viewpoint
Once you have installed ViewPoint, it will be visible as a shortcut in All Programs via your Windows Start button. A single click on the viewpoint v3.0* tab will open the following page: All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 32: Entering Venue Data
Plane 1 is used to simulate the main floor area from the stage to a rear bleacher or boundary. Plane 3 is used to simulate the furthest/highest audience area. Plane 2 is used for any audience area between Plane 1 and Plane 3. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 33 Overlayed ViewPoint screen (front fills not shown) There are 3 methods for entering venue Dimensions. 5.5.4.1 Direct If you have venue plans, enter the height, length and elevation for up to three planes. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 34 Note: You can also use this in reverse to calculate angles from X and Y data. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 35 Update venue, made to the direct form of venue dimensio n. You can switch back and forth between the single point survey and direct form at any time. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 36: Coverage Start And Stop
The choice of loudspeaker type depends on the application. See W8L Series Applications Guide section 5.4. If a mixed system is selected a further section to the right allows you to define the quantity of the lower cabinets. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 37: Array Fixing
Ground Stack Stack Bars are fixed between the grid and the rear splay holes of the lowest cabinet to set the overall system tilt. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 38: Designing A Flown Array
A system flown too high will be uncomfortable for the audience as the sound source will not coincide with the performance area. High arrays can also cause rear wall echoes to reflect back into a lower audience area. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 39 Example Venue view – inefficient design Array too high and, therefore, too curved for efficient cabinet-to-cabinet summation Array too curved for efficient cabinet-to-cabinet summation All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 40 If in doubt, keep the grid height near the height of the highest seats. DISPLAY™ - Martin Audio’s 3-D prediction programme - can be an invaluable decision making tool in these circumstances...
Page 41: Stacked Systems
A separate control dictates how many of the lower cabinet types are present. See later. 5.5.9 Stacked systems When Stack is selected the maximum number of cabinets is limited and instead of Array Height, Stage Height appears in its place. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 42: Venue Name
Whenever a value is altered the software will automatically recalculate splay angles. 5.5.12 Frequently asked questions Why is the top cabinet overshooting the furthest seat? All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 43 The cabinet rays are spaced further apart in the 45 – 75m area. Surely this means that just one cabinet is covering more than fifteen meters of the audience? All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 44: Using Viewpoint For Systems With Subwoofers
By default all W8LS splay angles are set to zero. If possible, raise the array height so that the W8LS cabinets are pointing downwards – or consider a parallel (side) W8LS or WLX subwoofer array. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 45 W8LC array pointing in the correct position for best coverage. Click the control to enable/disable this feature. Splay WLX For subwoofer placement and alignment tips, see section 5.7. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 46 Alternatively . . . 1) Click on the splay angle to be altered to select a cabinet. 2) Move the mouse pointer into the top half of the screen. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 47 0.2m or 0.5ft increments, depending on which unit system is selected. Using the gridlines it is possible to read off dimensions such as the depth of any part of the array. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 48 Array from which coverage Start/Stop distances are measured. Pick Points and Cabinet Positions Two grid pick points (front & rear) are shown for flown arrays. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 49 This displa ys the Nearest hole in the lifting bar and the Actual Angle of the grid when lifted at that hole. Note that ViewPoint will display a warning if there is no suitable hole available. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 50 Spread the array load across two rigging points Allow fine angular control using the motors All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 51 Should either of the pick loads become less than zero or the inter-cabinet forces become too high then a mechanical warning window will appear. 5.5.15.2 Stacked arrays All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 52 The push value (in Newtons) – shown circled on the left below - can be varied to simulate wind load. Zoom In This shows the ground-stack bar position required for the lowest cabinet angle. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 53 Arrays are extended by adding straighter sections All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 54 1&2 3&4 5&6 7&8 9&10 1&2 11&12 3&4 13&14 5&6 1&2 9-12 15&16 7&8 3&4 13-16 All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 55 Band Zoning and smooth coverage. The controller preset names shown on ViewPoint correspond to the preset names on our published Martin Audio DX1, XTA DP226 or XTA AudioCore data files. Please ensure that controllers are loaded with the recommended presets for the loudspeaker in use.
Page 56 5.5.19 Printing ViewPoint Printer Setup Select the Venue page and click on Setup. A printer and paper size may be selected via the normal Windows Print Setup panel. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 57 Select the Array or Processor page and click on Print. This will print a sheet showing all the rigging and patch information required to rig and cable an array. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 58 ViewPoint Support Martin Audio Limited is, first and foremost, a loudspeaker manufacturer and we provide software on that basis - to help Martin Audio users get the best performance from our products. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 59 ViewPoint software has been designed for use with selected Martin Audio W8L Series Line Array products only. It is based on accurate W8L Series loudspeaker measurements and is no t applicable to other manufacturers’ products. We do not claim to cater for every conceivable W8L Series combination or application but welcome your suggestions that may help improve future products and software.
Page 60 Dual progressive curvature array – lower section point Y = balcony height (6.5m) (Make a note of the Z height as well – you’ll need this for step 5 later) All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 61 Set the coverage stop to the furthest seat but exa ggerate the coverage start until the start line from the bottom of the lower cabinet extends towards the front balcony ear height. Dual progressive curvature array – upper section point Z = 6.5m All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 62 Set angle 6 (the angle between the upper and lower sections) to 7.5° iii. Set the grid tilt and upper 5 cabinet angles (1-5) to those used for the previous upper section in step 2) Complete system All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 64 The rest of the cabinets in the upper zone W8LC amplifier rack patch Standard W8LC presets configure Martin Audio DX1 or XTA DP226 outputs for the following controller-to-amplifier patches: All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 65 All LF All LF All LF W8LM amplifier rack patch W8LM presets 20-39 configure Martin Audio DX1 or XTA DP226 outputs for the following active (as shown) & passive (using low- mid o/p) contr-to-amp patches: DX1 or 12 x DP226...
Page 66 Up to 4 cabinets in the middle zone The rest of the cabinets in the upper zone Controller presets Your Martin Audio DX1 or XTA DP226 controllers must be loaded with the correct system preset files before use. See next section … Output limiters Please note that all W8L Series controller output limiters are set for a power amplifier gain of 32dB (x40).
Page 67 Audio. If your loudspeakers arrived without them please contact your supplier for a copy. You will need a 9 pin male-to- female RS232 cable (not the null modem type) if you wish to load binary presets from your pc into your Martin Audio DX1 or XTA DP226 controller. Very important warning:...
Page 68 There is a trade off between stereo coverage and far- field sound pressure level. Crossing paths at the rear of the venue gives maximum summation for maximum spl at the rear centre. DISPLAY™ view showing stereo set-up in narrow venue All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 69 Where line arrays are required to cover wider venues they may be opened out to aim almost straight down the room for ±45º coverage or even opened out a few degrees. L-R system aimed almost straight down wide room All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 70 Note that pairs of W8L series arrays may be horizontally splayed by up to 90° for very wide coverage with minimal gain between arrays. The Martin Audio heritage of W8L series loudspeakers gives them that typical Wavefront arrayability. No special spacing is required.
Page 71 It is common practice to use a short array that matches the upper section of the main inner array. This is then flown fly at the height to the main array to cover, for instance, upper arena side seats. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 72 It is very important for you to start off with these reference settings before attempting to time align your system for any physical misalignment. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 73 Adjust channel gain of sub to equalise LF output with W8L, W8LC or W8LM system The gain value is dependant on numbers of full range cabinets, numbers of subs, flown or ground stacked configuration All material © 2007. Martin Audio Ltd. Subject to change without notice. +2dB for 12xW8LC...
Page 74 Controller Reference Delays The multiple driver delays in standard Martin Audio presets are “Lock Linked” to a particular crossover reference delay channel. In the absence of any main (W8L, W8LC) delay requirement, the W8L and W8LC reference delays default to zero because they relate to the LF horn drivers whose acoustical centre is furthest from the cabinet grille –...
Page 75 W8LM + WLX configuration. Compensating for physical misalignment Similar length sub woofer arrays should be placed beside the main system for consistent performance and maximum impact throughout the audience area. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 76 70Hz!) 5) Don’t forget to switch the subwoofers back to normal polarity for maximum summation and impact! All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 77 Note that, although cardioid subwoofers produce less radiation directly to the rear, they are still affected by floor and wall boundaries and fine alignment is still necessary. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 78 Apron fill delay line setting = t down- fill - t apron fill (2.91ms for each metre) Set apron fill gain so that image appears to come from artist’s position All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 79 *Be aware that the human ear discharges more wax in humid conditions and this will tend to negate the improved high frequency propagation. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 80 Gusting side winds can dramatically effect mid and high frequency sound by changing the propagation direction as follows: S i n g l e s o u n d s o u r c e All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 81 A wind gradient associated with wind blowing towards a loudspeaker will "slow" its vertical wavefront differentially. The vertical wavefront will be slowed less near the ground and its sound path will veer upwards. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 82 On a fair day when the ground is warm and clouds are forming and being moved by a very light breeze, local winds may vary in direction and strength as illustrated below. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 83 A single pole (6dB per octave) high cut filter with a variable knee control down to 8KHz works well. Temperature effects All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 84 The same “inverse temperature gradient” can form above ice rinks and in many indoor All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 85 Air absorption reduces high and mid frequencies proportional to distance depending on relative humidity. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 86 You can also see that at 25 ° C and 40% humidity the distance is increased to 113m, which would cover the majority of situations. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 87 When equalising the W8L Series systems do not add mo re than 8dB of boost to compensate for air absorption if the system is to be driven hard. Delay systems should be considered if very dry (or windy) conditions are expected. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 88 The mid frequency elements of larger W8L Series columns are split into two drives which cover the upper, straighter far- field sections, and the lower, more splayed near- field sections. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 89 2) Band zoning (the progressive shelving control applied to the upper mid & high freque ncy sections of line array columns to partially compensate for air absorption) will be in coarser steps. Coverage won’t be as smooth. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 90 Please note that our standard controller limiters are set with finite attack times. This allows all them to pass transient signals to the full output capability of the MA4.2S All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 91 2 x 32A spurs which would supply the appropriate outlet strips via 32A breakers. Remember that, although the transient power demand will be the same for each W8L/Longbow section (see table earlier), medium to long-term power demand will be All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 92 This progressive shelving is called band- zoning because one extra mid frequency band and two extra high frequency bands drive the upper zones of the line array. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 93 This requires 6 outputs; 1 x LF, 2 x MF, 3 x HF . section 5.5.23. How do I patch my racks to take advantage of standard W8L/ longbow controller presets? Standard W8L or Longbow presets configure Martin Audio DX1 or XTA DP226 outputs for the following controller-to-amplifier patches: DX1 o/p 10 x...
Page 94 Controller-Amplifier Patching Examples (For W8L/Longbow pin-outs and cabling see later) System patch for 4 x W8L/Longbow array using 1 Martin Audio DX1 and 3 Martin Audio MA4.2S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 95 System patch for 6 x W8L/Longbow array using 1 Martin Audio DX1 and 5 Martin Audio MA4.2S power amplifiers (leaving 1 spare channel) All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 96 System patch for 8 x W8L/Longbow array using 1 Martin Audio DX1 and 6 Martin Audio MA4.2S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 97 System patch for 10 x W8L/Longbow array using 1 Martin Audio DX1 and 8 Martin Audio MA4.2S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 98 System patch for 12 x W8L/W8L Longbow array using 1 Martin Audio DX1and 9 Martin Audio MA4.2S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 99 System patch for 12 box W8L/W8L Longbow array using 1 Martin Audio DX1 and 9 Martin Audio MA4.2S power amplifiers arranged in 3-rack Master-Slave configuration All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 100 System patch for 16 x W8L/W8L Longbow array using 1 Martin Audio DX1 and 12 Martin Audio MA4.2S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 101 Ø In the LOWER position for the lower W8LD The lower W8L/Longbow MF & HF band zones are not used as the W8LD takes over their nearfield role. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 102 Full W8LS/WS218X + W8LD + W8L Longbow system examples using 8-way DX2 controller combination presets 8-way controllers can provide the patch configurations required to provide a full system comprising subwoofers, down-fills and main arrays. All material © 2007. Martin Audio Ltd. Subject to change without notice...
Page 105 8 cores we recommend that rental companies standardise on 8-cores for all NL8 or PA-Con cables to avoid confusion when using a mixture of products in the Wavefront range. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 106 Q. Why the odd sizes? A. Loudspeaker cables are available in a limited range of standard copper core sizes ie. 1.5mm², 2.5mm², 4mm², 6mm², 10mm² and 35mm². All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 107 Band zoning (the progressive shelving control applied to the upper mid & high frequency sections of line array columns to partially compensate for air absorption) will be in coarser steps. Coverage won’t be as smooth. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 108 This band zoning relies on the exceptional mid and high frequency performance provided by adequately powered high-efficient mid and high frequency sections. Please note that our standard controller limiters are set with finite attack times. This All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 109 Normal distribution practice applies – e.g. a 230Vac inlet 63A inlet would be split into 2 x 32A spurs which would supply the appropriate outlet strips via 32A breakers. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 110 Progressive mid and high frequency shelving is applied to the upper zones of W8LC columns to partially compensate for this air absorption. This progressive shelving is called band- zoning All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 111 Please note that the D-Sub connector on the rear of the DX1 is for loading Martin Audio control presets only. It does not facilitate PC equalizer control “on the fly”. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 112 Controller-Amplifier Patching Examples (For W8LC pin-outs and cabling see later) System patch for 4 x W8LC array using 1 Martin Audio DX1 and 3 Martin Audio MA2.8S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 113 System patch for 6 x W8LC array using 1 Martin Audio DX1 and 5 Martin Audio MA2.8S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 114 System patch for 8 x W8LC array using 1 Martin Audio DX1 and 6 Martin Audio MA2.8S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 115 System patch for 10 x W8LC array using 1 Martin Audio DX1 and 8 Martin Audio MA2.8S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 116 System patch for 12 x W8LC array using 1 Martin Audio DX1 and 9 Martin Audio MA2.8S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 117 System patch for 16 x W8LC array using 1 Martin Audio DX1 and 12 Martin Audio MA2.8S power amplifiers All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 118 System patch for 12 x W8LC system using 1 Martin Audio DX1 and 9 Martin Audio MA2.8S power amplifiers arranged in 3-rack Master-Slave configuration All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 119 Ø In the LOWER position for the lower W8LCD The lower W8LC MF & HF band zones are not used as the W8LCD takes over their nearfield role. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 120 W8LCD + W8LC presets. These patch configurations take advantage of the fact that the W8LCD LF can be driven with the same signal as a standard W8LC. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 123 8-way controllers can provide the patch configurations required to provide a full system comprising subwoofers, down-fills (with separate control of all bands) plus, of course, the main array. All material © 2007. Martin Audio Ltd. Subject to change without notice...
Page 126 Recommended loudspeaker cable 8-core cable is required for W8LCs. Although some Wavefront series loudspeakers use less than 8 cores we recommend that rental companies standardise on 8-cores for All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 127 Q. Why the odd sizes? A. Loudspeaker cables are available in a limited range of standard copper core sizes ie. 1.5mm², 2.5mm², 4mm², 6mm², 10mm² and 35mm². All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 128 93/68/EEC Low Voltage Directive for mains safety. All rack systems should be fully PAT (Portable Appliance) tested for electrical safety before use. What would typical W8LM racks look like? All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 129 We use carefully matched RC coupling networks to compensate for high frequency driver voice coil inductance. These coupling networks improve transient performance and present an easy load to the power amplifier. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 130 1500W How do I patch my racks to take advantage of standard W8LM controller presets? W8LM presets 20-39 configure Martin Audio DX1 or XTA DP226 outputs for the following active (as shown) or passive (using low- mid output) controller-to-amp patches:...
Page 131 Please note that the D-Sub connector on the rear of the DX1 is for loading Martin Audio control presets only. It does not facilitate PC equalizer control “on the fly”. All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 132 Rack patch examples – 4 x W8LM/LMD arrays All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 133 Rack patch examples – 8 x W8LM/LMD arrays All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 134 Rack patch examples – 12 x W8LM/LMD arrays All material © 2007. Martin Audio Ltd. Subject to change without notice...
Page 135 Rack patch examples – 16 x W8LM/LMD arrays All material © 2007. Martin Audio Ltd. Subject to change without notice...
Page 136 Worn, corroded or damaged pins and sockets can cause severe distortion or loss of signal. Recommended loudspeaker cable 4-core cable is required for W8LM /LMDs. The following table gives suitable copper core specifications for common applications: All material © 2007. Martin Audio Ltd. Subject to change without notice.
Page 137 Q. Why the odd sizes? A. Loudspeaker cables are available in a limited range of standard copper core sizes ie. 1.5mm², 2.5mm², 4mm², 6mm², 10mm² and 35mm². All material © 2007. Martin Audio Ltd. Subject to change without notice.

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